To provide a driver that adjusts the regulation of a moving range of a driven member (lens frame or the like) simply by adjusting an attaching position of an adjusting member from the outside of a case, and facilitates assembling work.

The driven member 15 having an arm projection 19 is stored in the case 12 fixed to a base frame 11 approachably and separably from the base frame, an electric-mechanical sensing element 16 and a driving member 17 are connected to the arm projection 19, the driving member 17 is supported by a friction engaging member 18 fixed to the base frame 11 or case 12, a bar-like projection 20 projected on the outer surface section of the driven member 15 is projected out of the case through an opening 12b disposed in the case 12, and the moving range of the driven member 15 is restricted by an adjusting member 21 position-adjustably attached to the outer surface of the case 12.